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/*
* Copyright (C) 2019-2024 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#if ENABLE(WEBASSEMBLY)
#include "BytecodeConventions.h"
#include "HandlerInfo.h"
#include "InstructionStream.h"
#include "MacroAssemblerCodeRef.h"
#include "WasmFormat.h"
#include "WasmHandlerInfo.h"
#include "WasmLLIntTierUpCounter.h"
#include "WasmOps.h"
#include <wtf/FixedBitVector.h>
#include <wtf/HashMap.h>
#include <wtf/TZoneMalloc.h>
#include <wtf/Vector.h>
namespace JSC {
class JITCode;
class LLIntOffsetsExtractor;
template<typename Traits>
class BytecodeGeneratorBase;
namespace Wasm {
class LLIntCallee;
class TypeDefinition;
struct GeneratorTraits;
struct JumpTableEntry {
int target { 0 };
unsigned startOffset;
unsigned dropCount;
unsigned keepCount;
};
using JumpTable = FixedVector<JumpTableEntry>;
class FunctionCodeBlockGenerator {
WTF_MAKE_TZONE_ALLOCATED(FunctionCodeBlockGenerator);
WTF_MAKE_NONCOPYABLE(FunctionCodeBlockGenerator);
friend BytecodeGeneratorBase<GeneratorTraits>;
friend LLIntOffsetsExtractor;
friend class LLIntGenerator;
friend class LLIntCallee;
public:
FunctionCodeBlockGenerator(FunctionCodeIndex functionIndex)
: m_functionIndex(functionIndex)
{
}
FunctionCodeIndex functionIndex() const { return m_functionIndex; }
unsigned numVars() const { return m_numVars; }
unsigned numCalleeLocals() const { return m_numCalleeLocals; }
uint32_t numArguments() const { return m_numArguments; }
const Vector<Type>& constantTypes() const { return m_constantTypes; }
const Vector<uint64_t>& constants() const { return m_constants; }
const Vector<uint64_t>& constantRegisters() const { return m_constants; }
const WasmInstructionStream& instructions() const { return *m_instructions; }
bool hasTailCallSuccessors() const { return m_hasTailCallSuccessors; }
const BitVector& tailCallSuccessors() const { return m_tailCallSuccessors; }
FixedBitVector&& takeCallees() { return WTFMove(m_callees); }
bool tailCallClobbersInstance() const { return m_tailCallClobbersInstance ; }
void setTailCall(uint32_t, bool);
void setTailCallClobbersInstance() { m_tailCallClobbersInstance = true; }
void setNumVars(unsigned numVars) { m_numVars = numVars; }
void setNumCalleeLocals(unsigned numCalleeLocals) { m_numCalleeLocals = numCalleeLocals; }
ALWAYS_INLINE uint64_t getConstant(VirtualRegister reg) const { return m_constants[reg.toConstantIndex()]; }
ALWAYS_INLINE Type getConstantType(VirtualRegister reg) const
{
ASSERT(Options::dumpGeneratedWasmBytecodes());
return m_constantTypes[reg.toConstantIndex()];
}
void setInstructions(std::unique_ptr<WasmInstructionStream>);
void addJumpTarget(WasmInstructionStream::Offset jumpTarget) { m_jumpTargets.append(jumpTarget); }
WasmInstructionStream::Offset numberOfJumpTargets() { return m_jumpTargets.size(); }
WasmInstructionStream::Offset lastJumpTarget() { return m_jumpTargets.last(); }
void addOutOfLineJumpTarget(WasmInstructionStream::Offset, int target);
WasmInstructionStream::Offset outOfLineJumpOffset(WasmInstructionStream::Offset);
WasmInstructionStream::Offset outOfLineJumpOffset(const WasmInstructionStream::Ref& instruction)
{
return outOfLineJumpOffset(instruction.offset());
}
inline WasmInstructionStream::Offset bytecodeOffset(const WasmInstruction* returnAddress)
{
const auto* instructionsBegin = m_instructions->at(0).ptr();
const auto* instructionsEnd = reinterpret_cast<const WasmInstruction*>(reinterpret_cast<uintptr_t>(instructionsBegin) + m_instructions->size());
RELEASE_ASSERT(returnAddress >= instructionsBegin && returnAddress < instructionsEnd);
return returnAddress - instructionsBegin;
}
UncheckedKeyHashMap<WasmInstructionStream::Offset, LLIntTierUpCounter::OSREntryData>& tierUpCounter() { return m_tierUpCounter; }
unsigned addSignature(const TypeDefinition&);
JumpTable& addJumpTable(size_t numberOfEntries);
unsigned numberOfJumpTables() const;
size_t numberOfExceptionHandlers() const { return m_exceptionHandlers.size(); }
UnlinkedHandlerInfo& exceptionHandler(int index) { return m_exceptionHandlers[index]; }
void addExceptionHandler(const UnlinkedHandlerInfo& handler) { m_exceptionHandlers.append(handler); }
private:
using OutOfLineJumpTargets = UncheckedKeyHashMap<WasmInstructionStream::Offset, int>;
FunctionCodeIndex m_functionIndex;
// Used for the number of WebAssembly locals, as in https://webassembly.github.io/spec/core/syntax/modules.html#syntax-local
unsigned m_numVars { 0 };
// Number of VirtualRegister. The naming is unfortunate, but has to match UnlinkedCodeBlock
unsigned m_numCalleeLocals { 0 };
uint32_t m_numArguments { 0 };
bool m_hasTailCallSuccessors { false };
bool m_tailCallClobbersInstance { false };
Vector<Type> m_constantTypes;
Vector<uint64_t> m_constants;
std::unique_ptr<WasmInstructionStream> m_instructions;
const void* m_instructionsRawPointer { nullptr };
Vector<WasmInstructionStream::Offset> m_jumpTargets;
Vector<const TypeDefinition*> m_signatures;
OutOfLineJumpTargets m_outOfLineJumpTargets;
UncheckedKeyHashMap<WasmInstructionStream::Offset, LLIntTierUpCounter::OSREntryData> m_tierUpCounter;
Vector<JumpTable> m_jumpTables;
Vector<UnlinkedHandlerInfo> m_exceptionHandlers;
FixedBitVector m_callees;
BitVector m_tailCallSuccessors;
};
} } // namespace JSC::Wasm
#endif // ENABLE(WEBASSEMBLY)
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